On google doc goto Extenstions > App Script and add following code and save.
If active, it will show a new menu item called "Dark Mode".
| function onOpen() { | |
| var ui = DocumentApp.getUi(); | |
| var menu = ui.createMenu('Dark Mode'); | |
| menu.addItem('Enable Dark Mode', 'enableDarkMode'); | |
| menu.addItem('Disable Dark Mode', 'disableDarkMode'); | |
| menu.addToUi(); | |
| } | |
| function enableDarkMode() { | |
| var doc = DocumentApp.getActiveDocument(); | |
| var body = doc.getBody(); | |
| body.setBackgroundColor('#1e1e1e'); | |
| var paras = body.getParagraphs(); | |
| for (var i = 0; i < paras.length; i++) { | |
| var para = paras[i]; | |
| para.editAsText().setForegroundColor('#ffffff'); | |
| } | |
| } | |
| function disableDarkMode() { | |
| var doc = DocumentApp.getActiveDocument(); | |
| var body = doc.getBody(); | |
| body.setBackgroundColor('#ffffff'); | |
| var paras = body.getParagraphs(); | |
| for (var i = 0; i < paras.length; i++) { | |
| var para = paras[i]; | |
| para.editAsText().setForegroundColor('#000000'); | |
| } | |
| } |